Alga Ulva Lactuca Research Articles

Potential antimicrobial properties of the Ulva lactuca extract against methicillin-resistant Staphylococcus aureus-infected wounds: A review.

Methicillin-resistant Staphylococcus aureus (MRSA), currently a major problem in hospitals worldwide, is one of the most common causes of nosocomial disease through surgical wound infection. MRSA-infected wounds have very low recovery rates and have become more problematic as some antibiotics are not effective against MRSA. Several antimicrobial and anti-inflammatory agents of green algae (Ulva lactuca) in the form of alkaloids, triterpenoids, steroids, saponins, and flavonoids have the potential to accelerate the wound healing process following MRSA wound infection. Various active compounds contained in the U. lactuca extract are thought to have multiple antibacterial and anti-inflammatory properties that can overcome the MRSA antimicrobial resistance and accelerate tissue growth in the wound healing process. This review aims to describe the potential of Ulva lactuca extract against MRSA-infected wound healing.

Enhancement of Biogas Production from Macroalgae Ulva latuca via Ozonation Pretreatment

One of the dominant species of green algae growing along the Mediterranean coast of Egypt is Ulva lactuca. Pretreatment can have a major effect on biogas production because hydrolysis of the algae cell wall structure is a rate-limiting stage in the anaerobic digestion (AD) process. The use of ozone, a new pretreatment, to boost biogas production from the green algae Ulva lactuca was investigated in this study. Ozonation at various dosages was used in contrast to untreated biomass, and the effect on the performance of subsequent mesophilic AD using two separate inoculums (cow manure and activated sludge) was examined. The findings indicated that, in different studies, ozonation pretreatment showed a substantial increase in biogas yield relative to untreated algae. With an ozone dose of 249 mg O3 g–1 VS algal for Ulva lactuca, the highest biogas output (498.75 mL/g VS) was achieved using cow manure inoculum. The evaluation of FTIR, TGA, SEM, and XRD revealed the impact of O3 on the structure of the algal cell wall and integrity breakage, which was thus established as the main contributor to improving the biogas production.

Phytochemical Constituents of Ulva Lactuca and Supplementation to Improve The Nile Tilapia (Oreochromis Niloticus) Haemato-Biochemical Status

This study was carried out to investigate the phytochemical constituents and biological screening of green algae (Ulva lactuca ) methanolic crude extract. The HPLC spectrum profile identified seven phenolic and flavonoid compounds namely: catechin, chlorogenic ,caffeic, quercetin, and major compounds, ellagic acid with 60.87 % and rutin with 33.40% of total area. The GC profile of fatty acids portions represented to relative distribution percentage were 9 compounds, the major fatty acids are lauric acid 55.0 % , caprylic acid 21.2 % , capric Acid was 19.8 and palmitic acid was 1.94% . The 17 amino acids produced from GC spectrum , the percentage of total amino acid were 25.98% .The most abundant amino acids were glutamic acid 2.34% , alanine 2.22 and aspartic 2.09, leucine 1.33 , valine 1.26 , phenylalanine 1.0 , therionine 0.98 and isoleucine 0.9%. of total amino acid. Tilapia (Oreochromis Niloticus) diets were divided into Ulva fermentation and multi enzymes, groups each with three different supplementations (LC, PRO, and LC + PRO). The result recorded the diets containing fermented Ulva with L-carnitine, probiotic ( LC+PRO) was the highest level of red blood cell ( RBCs , HGB) by 1.97 cmm , 10.63 g/d . Similarly, increase of Hematocrit (HCt) , WBCs, platelets, and lymphocytes due to the highest level of protein, albumin, and globulin in this diets also, U. lactuca contains a number of complex carbohydrates and polysaccharides. This study has revealed that U. lactuca seaweed is a rich source of protein ( 22% ) which is nutritionally superior to the terrestrial plant proteins and can be used to provide significant proportions of the protein requirements of fish as well as for human.

Physiological Response of Fenugreek (Trigonella foenum-graecum L.) plant Treated by Farmyard Manure and Two Selected Seaweeds as Biofertilizers.

A pot experiment was conducted to test the effect of two selected seaweeds belonging to different taxonomic group's Chlorophyceae (Ulva lactuca) and Rhodophyceae (Jania rubens) as well as farmyard manure (FYM) on growth and biochemical parameters of Trigonella foenum-graecum (fenugreek). Physico- chemical analysis of FYM and biochemical characterization of the two selected algae including (elemental analysis, hormones and pigments) were measured. Also, growth parameters of fenugreek as shoot and root length, total plant height, leaf area, fresh weight and biochemical parameters including carbohydrates fractions (direct, total reducing value, polysaccharides), nitrogen fractions (in soluble protein, total soluble nitrogen and total nitrogen), chlorophyll contents (Ch a , b ) and carotenoid in addition to fatty acids were estimated. The obtained results clarified that Jania rubens has a pronounced stimulatory effects on test plant if compared with Ulva lactuca and FYM respectively. Since, the alga has a high amount of macro, micro elements as well as phytohormones indole acetic acid (IAA, 110 ug/g), Kinetin (Kin, 68ug/g), naphthalene acetic acid (NAA 50 ug/g) and gibberellins (GA3, 11 ug/g). The alga increased growth parameters (root length, 8.8cm, shoot length 9 cm, leaf area 1.6 cm and fresh weight was 0.40 g). The alga enhanced pigment fractions with special reference Ch (b) since it was 1.15 mg/g more than its irrespective values in Ulva and FYM. As well as insoluble protein was 19.09 mg/g, total soluble nitrogen was 39.71 mg/g and total nitrogen was 180 mg/g. Also, the alga has a promotive effect on total carbohydrates since it was 82.84 (mg/g). Moreover, the different treatments led to a reduction in saturated fatty acids (SFA) and increase the unsaturated fatty acids (USFA) if compared with control. The fatty acids profile was due to the reduction of C18:0, C20:0 and increase in C18:1, C18:2 and C18:3.The objective of this study is to evaluate the effect of two selected marine algae Ulva lactuca (Chlorophyta) & Jania rubens (Rhodophyta) as well as FYM on some phenological and biochemical parameters of Trigonella foenum-graecum .

Пищевой ингредиент на основе морской зелёной водоросли в составе хлебобулочных изделий. Риски и потенциал

The paper presents the results of the development wheat bread using a new ingredient – a water-ethanol extract of the sea green alga Ulva lactuca, which contains biologically active substances, minerals, trace elements, and has a proven positive effect on the human body. Rational dosages of the extract have been selected, eliminating the technological risks of its use in the recipe for bakery products. The safety and quality of a new food ingredient and bakery products with its addition is shown in accordance with the requirements of the regulatory documents of the Russian Federation and the EAEU. This work was supported by the Council for Grants of the President of the Russian Federation for State support of young Russian scientists. Grant number is MK-3686.2021.4. The topic of the scientific research is «Rational use of processed products of non-fish objects of water industry in the technology of safe and high-quality food»

Effects of extrinsic abiotic factors on induction of gametogenesis and efficacy of a device for the segregation of non-fused gametes and zygotes in the green alga Ulva lactuca

ABSTRACT Seaweed aquaculture is one of the fastest growing marine sectors with 31.2 million tonnes year–1 of harvest worth over 11.7 billion USD. Commercial operations still rely on traditional techniques but innovative strategies are essential for future expansion. The present paper reports on a simple device that could effectively segregate non-fused haploid gametes from diploid zygotes in the green alga Ulva lactuca. The differential phototactic behaviour of gametes and zygotes was used for their separation. Approximately 56.2% non-fused haploid gametes and 5.3% diploid zygotes were separated after 5 min and after 1 hr and 2 hr, the composition of gametes was 26.6 and 8.8%, respectively while that of zygotes 32.7 and 57.4%, respectively. The effects of extrinsic abiotic factors, including light, temperature, salinity, photoperiod, dehydration and thallus fragmentation, on the induction of gametogenesis was found to be limited at 35°C (13.33 ± 5.77%) and a short day 9:15 h light:dark photoperiod (20 ± 4.08%), while dehydration treatments enhanced spore induction. This study demonstrated the efficient and cost-effective utilisation of locally available materials in producing a simple, small, precise, durable and easy to use system, which also saved on energy. The effective segregation of non-fused gametes from zygotes aids in cytological preparation, bio-chemical characterisation investigations as well as breeding and hybridisation all of which have direct implications on the future farming of Ulva and other species of seaweeds with similar life phases.

Beneficial Effects of Algerian Green Alga Ulva lactuca and Its Hydroethanolic Extract on Insulin Resistance and Cholesterol Reverse Transport in High-Fat/Streptozotocin Diabetic Rats

The aim of this study was to evaluate the impact of the green algae Ulva lactuca and its hydroethanolic extract on insulin resistance and cholesterol reverse transport in type 2 diabetic (T2D) rats. Rats had T2D induced by a high-fat diet (HFD) for 5 weeks followed by intraperitoneal injection of streptozotocin. Diabetic rats were divided into three groups and were fed a HFD in the presence or absence of 1% alga (HFD-Alg) or 1% of its hydroethanolic extract (HFD-Ext), for 4 weeks. The control group consumed 20% casein combined with 5% lipids. Hyperglycemia, insulin resistance, hypercholesterolemia, and hypertriglyceridemia were noted in HFD rats vs control rats. Whole alga and its extract decreased these parameters vs the HFD. Moreover, fecal total cholesterol and triacylglycerols levels were lowered in HFD group vs C group, but were increased with HFD-Alg vs HFD. Compared with the Control, the HFD group had decreased lecithin:cholesterol acyltransferase (LCAT) activity, apolipoprotein A-I (ApoA-I), high-density lipoprotein (HDL3)-phospholipids (PL), and HDL2-cholesteryl ester (CE) levels, but increased HDL3-unesterified cholesterol (UC) levels. Furthermore, compared with the HFD group, the HFD-Alg and HFD-Ext groups had increased LCAT activity, ApoA-I, HDL3-PL, and HDL2-CE levels and decreased HDL3-UC levels. In addition, in the HFD-Ext group, LCAT activity and ApoA-1 levels were decreased vs the HFD-Alg whereas HDL3-UC levels were increased. In conclusion, these results indicate that U. lactuca and its hydroethanolic extract have curative effect on T2D. Therefore, this alga could be considered a functional food supplement for the treatment and prevention of diabetes.

Photosynthetic fluctuation accompanied by translocation of chloroplasts in Ulva conglobata (Ulvophyceae) grown under a low irradiance regime

SUMMARYFluctuations in photosynthetic characteristics related to chloroplast translocation have been known in the foliose green algae Ulva lactuca var. latissima and var. rigida and U. mutabilis according to photoperiod. In Ulva, the single parietal chloroplast is found along the thallus surface wall and exhibits high photosynthetic activity during the light period; the chloroplast then moves towards the side walls and shows low photosynthetic activity during the dark period. In this study, we re‐investigated whether the photosynthetic ability is dependent on chloroplast location in a unialgal culture of U. conglobata grown and maintained under low irradiance regime by analyzing in vivo absorption spectra, oxygen evolution, and pulse amplitude modulation chlorophyll fluorescence. The light absorbance of the thallus was higher when chloroplast was along the thallus surface wall than when along the side walls and, therefore, the thallus absorbance at 680 nm was used as an index of chloroplast position. Some photosynthetic parameters such as maximum net photosynthetic rate per thallus area and effective quantum yield of photosystem II correlated with the thallus absorbance. The highest rate and absorption were reached 3 to 9 h after the beginning of light period (12 h), which gradually decreased at 10 to 15 h after the beginning of light or dark period. The lowest rate and absorption was observed after the beginning of the dark period. The chloroplast movement was inhibited for 12 h by colchicine, and photosynthetic parameters were found to be dependent on various chloroplast positions in the thallus. Interestingly, the chloroplast moved to the surface and the side walls of the cells under continuous dark and light conditions, respectively, at approximately 48 to 72 h. However, decreased maximum quantum yield was observed under both continuous dark and light conditions.

Structural Characterization and Hypoglycemic Effect of Green Alga Ulva Lactuca Oligosaccharide by Regulating MicroRNAs

Structural Characterization and Hypoglycemic Effect of Green Alga Ulva Lactuca Oligosaccharide by Regulating MicroRNAs

UJI AKTIVITAS ANTIOKSIDAN EKSTRAK GANGGANG HIJAU (Ulva lactuca L.) DENGAN VARIASI KONSENTRASI PELARUT ETANOL 60%, 75%, DAN 96% MENGGUNAKAN METODE DPPH (1,1-difenil-2-pikrilhidrazil)

Free radicals give a negative effect. According to earlier research, Spyrogyra and Ulva lactuca L. have an anti-oxidant activity. This research aim to knowing the extract potential of green algae (Ulva lactuca) with variety concentration solvent as anti-oxidant by DPPH method, and finding the price of IC50 ethanol extract which compared with Galat acid. Extraction technic was maseration with ethanol solvent 60%,75%, and 96% which is implemented a qualitative test of extract active compound of U. lactuca Antioxidant activity of U. lactuca extract measured with spektrofotometri by using DPPH (1,1-difenil-2-pikrilhidrazil) method to get percentation of free radical resistor. The analytical result using SPSS, statistically got 95% credibility (p=0,05). This research showed that activity of antioxidant ethanol extract 96% of U. lactuca was higher than ethanol extract 60% and 75%. Activity of antioxidant ethanol extract 60%,75%, and 96% which confirmed by value of IC50 continously are 441,70 mg/ml ; 242,10 mg/ml dan 2,04 mg/ml. Whereas the value of IC50 galat acid standard is 3,92 x 10-3mg/ml. Based on tests of conducted antioxidant activity, the gallic acid has a strong antioxidant power, U. lactuca have a very weak antioxidant power

Seagrass Cymodocea nodosa and seaweed Ulva lactuca as tools for trace element biomonitoring. A comparative study

This study compared the capacity of the seagrass Cymodocea nodosa and the green alga Ulva lactuca to sequester the trace elements Cd, Cr, Cu, Ni, Pb and Zn, in seawater and benthic sediments, under the same environmental conditions. Samples of C. nodosa leaves and U. lactuca thalli were collected in four sites off the coast of Sicily (Italy), with varying degrees of anthropogenic impact. C. nodosa accumulated generally higher levels of trace elements, suggesting a better performance in marine phytoremediation. In turn, C. nodosa and U. lactuca showed a similar performance regarding the bioindication of trace elements. Since salinity, temperature and pH had relatively constant values, their role in the accumulation processes in both species should be considered as secondary. Although C. nodosa and U. lactuca fulfill several criteria as bioindicators, including widespread distribution, abundance and tolerance to toxicity, their regular use in biomonitoring programs is still limited.

Structural characterization and hypoglycemic effect of green alga Ulva lactuca oligosaccharide by regulating microRNAs in Caenorhabditis elegans

The novel oligosaccharides from Ulva lactuca were obtained and characterized by nuclear magnetic resonance, Fourier-transformed infrared and liquid chromatography-quadrupole time-of-flight tandem mass spectrometry. U. lactuca oligosaccharides were composed by β-D-Glcp-(1 → 4)-α-L-Rhap (2SO3−)-(1 → 2)-β-D-GlcpA-(1 → 6)-β-D-Galp-(1 → 5)-α-L-Arap-(1→ and α-L-Rhap-(1 → 2)-α-L-Rhap(3SO3−)-(1 → 6)-β-D-Glcp-(1 → 2)-β-D-Xylp-(1→ with a branch of β-D-GlcpA that connected in C4 of β-D-Glcp, respectively. After U. lactuca oligosaccharide treatment, the mean lifespan, glucose levels, and insulin resistance were improved in Caenorhabditis elegans. It has significantly enhanced the total superoxide dismutase levels and ameliorated the intracellular reactive oxygen species accumulation. U. lactuca oligosaccharides could prevent the DNA and mitochondrial damage induced by high glucose. The gene expression levels of abnormal dauer formation 16 (DAF-16), protein kinase B (AKT-1), protein skinhead-1 (SKN-1), adenosine monophosphate-activated kinase 2 (AAK-2), DAF-15, and superoxide dismutase 3 (SOD-3) were up-regulated though inhibiting the expressions of miR-48-5p, miR-67-3p, miR-124-3p, and miR-85-3p, while the gene expression levels of DAF-2, LEThal 363 (LET-363), and signal element on X 1 (SEX-1) were also up-regulated. U. lactuca oligosaccharides might be applied in the functional foods to improve glucose metabolism disorders and antioxidant systems in vivo mediated by modulation of microRNAs.

Assessment of trace element contamination and bioaccumulation in algae (Ulva lactuca), bivalves (Spondylus spinosus) and shrimps (Marsupenaeus japonicus) from the Lebanese coast

In this study, levels of 20 trace elements (Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Ag, Cd, Sn, Sb, Ba, Hg, Pb and U) and the respective biota–sediment accumulation factors (BSAF) were assessed for three marine species from the Eastern Mediterranean (Lebanese coast) belonging to different trophic levels in the food chain (algae, bivalves and shrimps). Multivariate analyses showed significant differences in trace element accumulation between seasons, sites and species thus highlighting the importance of a multi-species and seasonal approach to monitor trace metals in coastal areas. Biota–sediment accumulation factors (BSAF) showed limited transfer from sediments to marine organisms suggesting that the bioaccumulation of trace elements by marine organisms should be assessed by considering multiple sources of contaminants. Lead (Pb) levels (0.07–4.44​ mg.kg−1) measured in algae and Cd (0.54–7.74 mg.kg−1) and Zn (42.88–972​ mg.kg−1) levels found in the oyster, were similar and sometimes higher than those found in other polluted areas indicating that the Lebanese coast is subject to environmental pollution.

Comparative study of the insecticidal activity of a high green plant (Spinacia oleracea) and a chlorophytae algae (Ulva lactuca) extracts against Drosophila melanogaster fruit fly

Currently, the global interests tend to take advantage of the plant world as a renewable source of a natural and effective molecule, to find an eco-friendly, cost-effective, and less toxic alternative to the current synthetic pesticide. In this context, the present research was carried out in an attempt to study the insecticidal activity of extracts and pigments derived from the green plant Spinacia oleracea and the green alga Ulva lactuca against the fruit fly Drosophila melanogaster as an alternative to chemical insecticide. The toxicity of the aqueous, acetonic and ethanolic extracts as well as of the purified pigments (Chlorophylls and carotenoids) was determined by complementary in vivo tests (application by spraying oranges, toxicity by ingestion and repellent activity). Interestingly, each one of these methods corresponds to a specific mode of exposure. Results showed that acetone extracts, which are rich in green pigments, present the best insecticidal activities. On the other hand, the purified chlorophyllian pigments exhibited an interesting activity only by spraying method. Regarding the repellent activity, the aqueous extract of spinach displayed higher effectiveness. Our study suggests the potential of tested plant and algal extracts, as well as of chlorophyllian pigments, to provide a safer alternative way to the use of synthetic pesticides.

Gastroprotective Effect of Green Algae Extract (Ulva lactuca L) on Gastric Rats

Gastric ulcer is a disease of the digestive tract characterized by mucous damage to secretion of gastric acid and pepsin. One of the potential gastroprotector plants is green algae. The purpose of this study was to examine the gastroprotective effect of ethanol extract of green algae (EEGH) Ulva lactuca L on the gastric of ethanol-induced rats. This study used 36 rats, divided into 6 groups. Group I is a normal group. Group II negative control, ethanol 96% induced. Group III positive control, given comparison of ranitidine dose of 15.75 mg/kgBW. Groups IV, V and VI were given multilevel EEGH, namely 125, 250 and 500 mg/kgBW. The treatment was carried out for 14 days, on the 14th day ethanol 96% was induced and then dissected. Research data on gastric ulcer index and protection ratio were analyzed using One Way ANOVA with a confidence level of 95%. The results of the EEGH statistical test dose of 500 mg/kgBW with negative controls showed a significant difference with p value of 0.013 (p<0.05). The EEGH 500 mg/kgBW has the ability as an effective gastroprotector, as seen from the gastric ulcer index value of 0.5 and the protection ratio of 78.94%.Keywords: Ethanol, gastroprotector, protection ratio, ulcer index, Ulva lactuca L.78,94%.

Testing the carbonization condition for high surface area preparation of activated carbon following type IV green alga Ulva lactuca

Activated carbon with high specific surface area has been produced from green alga Ulva lactuca by using zinc chloride (ZnCl2) solution as an activating agent under carbonization temperature ranged from 500 to 900 °C. The effects of carbonization temperatures, holding time, and amount of ZnCl2 followed by soaking in hydrochloric acid on the specific surface area, pore morphology, and mass yield of the prepared activated carbon were investigated. In this work, the activated carbon with high specific surface area was achieved using 1:2 (ZiCl2: Ulva lactuca) impregnation agent, 700 °C as activation temperature, 30 min as holding time, and soaking with 3.0 M hydrochloric acid as the optimum conditions. This condition produced an activated carbon with specific surface area (SBET) and micropore surface area (Smi) of 1486.3 and 1582.04 m2/g, respectively, with mean pore diameter (DP) of 2.39 nm. The results showed that the chemical activation by ZnCl2 is a useful technique for obtaining activated carbon from Ulva lactuca with desired pore size distributions and morphology at moderate activation temperatures.

An experimental assessment of algal calcification as a potential source of atmospheric CO2.

Marine vegetated ecosystems such as seagrass meadows are increasingly acknowledged as important carbon sinks based on their ability to capture and store atmospheric carbon dioxide, thereby contributing to climate change mitigation. Most studies on carbon storage in marine ecosystems have focused on organic carbon, leaving inorganic carbon processes such as calcification unaccounted for, despite of their critical role in the global carbon budget. This is probably because of uncertainties regarding the role of calcification in marine carbon budgets as either atmospheric CO2 source or sink. Here, we conducted a laboratory experiment to investigate the influence of a calcifying alga (Corallina officinalis L.) on seawater carbon content, using a non-calcifying alga (Ulva lactuca L.) as a control. In a first part, algae were incubated separately while measuring changes in seawater pH, total alkalinity (TA) and total dissolved inorganic carbon (DIC). The amount of carbon used in photosynthetic uptake and production of CaCO3 was then calculated. In a second, directly following, part the algae were removed and DIC levels were allowed to equilibrate with air until the pH stabilized and the loss of CO2 to air was calculated as the difference in total DIC from the start of part one, to the end of the second part. The results showed that C. officinalis caused a significant and persistent reduction in total dissolved inorganic carbon (DIC), TA and seawater pH, while no such permanent changes were caused by U. lactuca. These findings indicate that calcification can release a significant amount of CO2 to the atmosphere and thereby possibly counteract the carbon sequestration in marine vegetated ecosystems if this CO2 is not re-fixed in the system. Our research emphasises the importance of considering algal calcification in future assessments on carbon storage in coastal areas.

Sorptive performance of marine algae (Ulva lactuca Linnaeus, 1753) with and without ultrasonic-assisted to remove Hg(II) ions from aqueous solutions: optimisation, equilibrium and kinetic evaluation

ABSTRACT In this study, biosorption processes performed with and without ultrasound-assisted were presented for the first time comparatively. For this purpose, the potential for use of Ulva lactuca Linnaeus 1753 (U. lactuca) which is a macroalgae, as an alternative biosorbent was investigated for Hg(II) removal from aqueous solutions. Both conventional univariate and multivariate methods were evaluated to optimise biosorption processes. Biosorption equilibrium time was determined as 60 min for without ultrasound-assisted method, while it was only 3 min for ultrasound-assisted method. Biosorption processes were optimised by Central Composite Design (CCD) and successfully described by quadratic polynomial models as a function both of R (%) and qe (mg/g). In optimum conditions (Co = 125 mg/L, m = 30 mg, pH = 4.0 for ultrasound-assisted method and pH = 2.0 for without ultrasound-assisted method), removal efficiencies were achieved experimentally as 95.8% ± 0.2 and 96.1% ± 0.7 (N = 2), respectively. Models with high regression coefficients (R 2(adj) > 95%) obtained from Response Surface Methodology (RSM) were found to be applicable to the estimation of biosorption data. Biosorption equilibrium data was defined by Langmuir model. Langmuir’s maximum sorption capacity was increased from 125.6 to 232.0 mg/g when ultrasound-assisted method was applied. According to the results of kinetics evaluation, both biosorption processes were thermodynamically possible, endothermic (ΔHº>0) and spontaneous reactions (ΔGº<0) controlled by chemisorption based on the pseudo-second-order kinetic models. Results showed that ultrasound-assistance to the biosorption process contributed positively to increasing the rate of reaction and allowing sorption to be completed in a shorter time by facilitating sorption mass transfer.

Efficacy of Immobilized Biomass of the Seaweeds Ulva lactuca and Ulva fasciata for Cadmium Biosorption

The removal efficiency for Cd (II) by the marine algae Ulva fasciata and Ulva lactuca was studied at different culture conditions. The maximum biosorption capacities were 8.353 and 8.804 mg g−1 dwt for U. fasciata and U. lactuca, respectively, at optimum conditions for each alga. Ten milliliters of 4% calcium alginate immobilized different algal weights. Effect of different factors such as pH, temperature, contact time, biosorbent dose, and agitation speed on Cd (II) biosorption was examined. The results demonstrated the highest absorption efficiency obtained by using 0.05 and 0.15 g for U. fasciata and U. lactuca, respectively, as compared with the control. The results of Fourier transform infrared analysis for the fresh algae and pretreated algal biomasses demonstrated that hydroxyl, amide with hydrogen bond, and carbonyl extension in carboxyl groups played a significant role in biosorption. The biosorption mechanism was also investigated by energy-dispersive X-ray analysis; the results showed the presence of cadmium ion signal at 3.1 keV after the biosorption process. Immobilization of different weights of algae by using calcium alginate enhanced the biosorption capacity in case of low weight. Comparison of immobilized algal beads before and after Cd (II) biosorption showed morphological changed as shown by SEM. Ion exchange was the mechanism involved in Cd (II) biosorption by algae as elucidated by EDX analysis.

Lipid Composition, Content of Polyphenols, and Antiradical Activity in Some Representatives of Marine Algae

Qualitative and quantitative composition of the lipid complex and total content of polyphenols were compared in aqueous alcoholic extracts from three species of marine macrophytes collected in Peter the Great Bay, the Sea of Japan. Examined seaweeds belonged to different phyla: green alga Ulva lactuca L. sea lettuce, brown alga Sargassum pallidum (Turner) C. Agardh sargassum pallidum, and red alga Ahnfeltia tobuchiensis (Kanno et Matsubara) Makijenko ahnfeltia tobuchiensis. It was shown that glycolipids (30.3–41.5%) and neutral lipids (34–48.5%) prevailed among total lipids in the extracts from all three algal species; phospholipids accounted for 10–25.7% of total lipids. Among neutral lipids in all the seaweeds, triacylglycerols and free sterols prevailed. The greatest quantity of triacylglycerols was found in A.tobuchiensis and that of free sterols was in S. pallidum. As to the individual fractions of phospholipids, their composition and content considerably differed. In terms of content, predominant phospholipid fractions in the extract from U. lactuca were phosphatidyl glycerol, phosphatidyl ethanolamine, and phosphatidyl inositol, those from S. pallidum were phosphatidyl ethanolamine and phosphatidyl glycerol, and those from A. tobuchiensis were phosphatidyl choline and phosphatidyl glycerol. As to the percentage of main fatty acids comprising the lipid component of the extracts from the examined algal species, it was found that the extract from brown alga S. pallidum contained the greatest content of PUFA from the family n-6. The extract from green alga U. lactuca contained the greatest content of PUFA from the family n-3. In the extract from red alga A. tobuchiensis, arachidonic (family n-6) and eicosapentaenoic (family n-3) acids prevailed among PUFA. The greatest quantity of polyphenols was detected in the extract from brown alga S. pallidum, which 15–24 times exceeded respective figures in U. lactuca and A. tobuchiensis. Moreover, the extract from S. pallidum showed a much higher level of antiradical activity in respect to ABTS+, which was 5–12.5 times greater than in U. lactuca and A. tobuchiensis, respectively.